Hiyashi-chuka is basically a dish of cold noodles with selected ingredients mixed together with a sauce. There are no rules in what types of ingredients you want to accompany this dish. As you can see below, the one I had tonight included ham, egg, cucumber, tomato, corn, and avocado with cold Ramen.

The method is basically boil your preferred noodles (Ramen, Udon, Soba, Somen, etc) and rinse it under cold water and leave to cool.

Once the toppings are placed into the bowl, you can pour/scoop as much or as little sauce into the bowl and mix the noodles together.

The sauce is the most important part of this dish, and the recipe for 2 types of popular sauces are here.

Method:
Boil water and add chicken powder to create chicken stock (or you can buy premade stock)
Add the hot stock and sesame sauce into a bowl and mix well.
Add the rest of the ingredients and leave it to cool.